This is the thicker of the two bearings that fits in the sidecar wheel hub, of Watsonian sidecars. This bearing - unlike the other sidecar bearing we are currently selling - is DEFINATELY NOT readily available. Timken have a 'location' system for finding their bearings acrosss Europe and at the moment these bearings are totally unavailable. The last one we heard of being sold (about 3 years ago) fetched £450+VAT, so go figure that one......We're selling this under cost price, as part of a 'clearance sale' we're having on sidecar parts.